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    <title>Document</title>
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    <table>
      <tr>
        <td><input type="text" class="inp1" /></td>
        <td>
          <select name="" id="">
            <option>+</option>
            <option>-</option>
            <option>*</option>
            <option>/</option>
          </select>
        </td>
        <td><input type="text" class="inp2" /></td>
        <td><button class="btn1">=</button></td>
        <td colspan="2"><input type="text" class="inp3" /></td>
      </tr>

      <tr>
        <td><input type="text" class="inp4" /></td>
        <td><button class="btn2">计算水仙花的数量</button></td>
        <td><input type="text" class="inp5" /></td>
        <td><button>=</button></td>
        <td colspan="2"><input type="text" class="inp6" /></td>
        <!-- <td></td> -->
      </tr>

      <tr>
        <td><input type="text" class="inp7" /></td>
        <td><button class="btn3">计算包含七的倍数</button></td>
        <td><input type="text" class="inp8" /></td>
        <td><button>=</button></td>
        <td colspan="2"><input type="text" class="inp9" /></td>
      </tr>

      <tr>
        <td><input type="text" class="inp10" /></td>
        <td><button class="btn4">是否平年</button></td>
        <td colspan="3"><input type="text" class="inp11" /></td>
      </tr>

      <tr>
        <td colspan=""><input type="text" class="inp12" /></td>
        <td><button>偶数累加和</button></td>
        <td "><input type="text" class="inp13" /></td>
        <td><button class="btn5">=</button></td>
        <td colspan="2"><input type="text" class="inp14" /></td>
      </tr>
    
      <tr>
    <td><input type="text" class="inp15" /></td>
    <td><button class="btn6">求水仙花个数</button></td>
    <td><input type="text" class="inp16" /></td>
    <td><button>=</button></td>
    <td><input type="text" class="inp17" /></td>
    </tr>
   </table>
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